Kamal + Docker Tutorial

How to dockerize a tiny application, and deploy it using Kamal with a third party proxy, such as HAProxy.

• Docker Tutorial Part 1: Application Deployment with Docker
  • Create a Flask Slice
    • Disable nginx
  • Install docker
    • Method 1: Debian Official Packages
    • Method 2: Directly From Docker
  • Build a Docker Image of your Application
    • Run your new image in a container
    • Stop your container
  • Push your docker image to a Registry
    • Login to the Registry
    • Push your Image to the Registry
  • Deploy your docker image to a New Slice
    • Create a test Slice to “pull” into
    • Install docker
    • Login to the Registry
    • Pull your Image from the Registry
• Docker Tutorial Part 2: Orchestration with Kamal
  • Install Kamal
    • Make your application directory a git repository
    • Install dependencies for ruby packages
  • Configure Kamal
    • Install a target server slice
    • Create deploy.yml
    • Export KAMAL_REGISTRY_PASSWORD
  • Deploy with Kamal
    • Further testing
• Docker Tutorial Part 3: Kamal with Alternative Proxy
  • Using an Alternative Proxy
    • Opening Ports
    • Resolving port conflicts
    • Applying Group Sizes
    • Setting Environment Variables per-server
    • Putting it All Together